Revelation 4:6
and before the throne, as it were a glassy sea like crystal; and, in the midst of the throne, and around the throne, four living creatures full of eyes before and behind.
Revelation 4:3
and He Who was sitting was, in appearance, like a jasper stone and a sardius; there was a rainbow round about the throne, in appearance, like an emerald;
Revelation 21:11
having the glory of God; her radiance was like a stone most precious, as a jasper stone clear as crystal;
Treasury of Scripture Knowledge
Summary
And the likeness of the firmament upon the heads of the living creature was as the colour of the terrible crystal, stretched forth over their heads above.
The likeness
Bible References
The likeness
Revelation 4:3
and He Who was sitting was, in appearance, like a jasper stone and a sardius; there was a rainbow round about the throne, in appearance, like an emerald;
Revelation 21:11
having the glory of God; her radiance was like a stone most precious, as a jasper stone clear as crystal;